And FYI I am flabbergasted that apparently some call a bilge keel a rolling chock?
Answer âBâ. Shell Bitt
That oneâs been around long enough for de Kerchoveâs 1949 International Maritime Dictionary to call it out as incorrect in his rolling chock entry (he says rolling chocks support engines and boilers, and stabilize upper yards).
Iâd be inclined to call it a recessed bitt, and I see that some suppliers agree with me. Some of them call it a recessed shell bitt (possibly because the casting forms an integral shell around the bitt, like Mary on the half shell**?).
**In case thatâs too regionalâŚ
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Recessed bitt.
TrueâŚRecessed Bitt, Recessed Shell Bitt, or just Shell Bitt. With the last being the only choice listed. The question looked too much like a test question, thus âBâ being the most correct.
I sailed on LASH ships and ones that were converted LASH ships and they were on the hull. On the last one I was on I had a preventer bar welded between the bit on casting to prevent an eye being easily put on the bit. The castings had very little structural reenforcement behind it. We didnât want a tug to put a line on them and put a strain.
Another example of bayou bastardized nautical terms. I canât tell you how many times shipyard guys roll their eyes at me when I say something along the lines of âyou mean the bilge keelâŚâ
Donât get me started though about what a true Panama chock is and what it is not though⌠sore subject here. 
Suffice to say⌠this is a âmooring pipeâ (or a bazillion other names Iâve heard them called) and is not a Panama chock:
Isnât it a closed chock meeting the strength specifications for the Panama Canal?
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If it meets the strength requirements⌠yes⌠but the ones on most OSVâs in the middle of the bulwark for fairleading lines though? Yeah, good luck with one of them meeting the strength requirements (minimum 45 ton SWL).
Unless youâve got some insane scantlings on that bulwark, youâre going to need it welded to the deck with a doubler plate and some pretty hefty reinforcements.
As you say, much heavier specification than what you illustrated. Thanks.
The purpose here is to be understood. There is the correct technical term for items and than there are colloquialism / slang / local terms.
Correcting a crew member that says âgangwayâ instead of accommodation ladder is unnecessary and likely to be seen as overly pedantic. On the hand if the purpose of the communication is to order parts than better to get the correct term from the shipâs drawings.
In the case of a door being called a hatch that is wrong and potential confusing, should be corrected.
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Ok, hereâs a term Iâm trying to think of but canât remember:
Description:
You have a ship with a midship house. At the level of the weather deck there are passageways running along each side of the midship house, so you can walk from one end of the ship to the other without entering the house. The outboard side of these passageways is typically a low bulwark. The overhead is the underside of the the next deck up (01).
What is the specific term for these outer passageways? Iâve completely forgotten.
The Burma road
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Promenade deck?
Donât know. That seems like the kind of thing the shipâs crew would have a name for.
On the Hamilton Class Coast Guard cutters the approx equivalent was called the Air Castle
If a person was on the forecastle going through the door just above the âOâ in COAST they could walk under the 01 deck / flight deck to the fantail.
From Wikipedia:
- MK2 Brandon Scott scrubs a bulkhead outside of the air castle during the all-hands wash-down of the U.S. Coast Guard Cutter Bertholf, July 21
It is on cruise ships but Iâve never heard it applied to a working ship.
The name I seem to remember from the dim reaches of the past is âbreezewayâ. Which, I know, sounds like something in a 1950âs Florida-style home. Maybe something off the lanai (whatever a lanai is). But in regards to the facet of nautical architecture Iâm describing, the name makes perfect sense.
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I soon reached the second deck and seconds
later had reached the main deck. This part of the main
deck was located under the superstructure and was
known as the âair castle.â The shipâs service store and
soda fountain were located directly across the passageway from the top of the ladder
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Breezeway seems to ring a bell.
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Iâve been confused by hearing âanchor awayâ when being told âanchor aweigh.â And âshots on deckâ has messed me up, too (the phrase makes no sense to me with an anchor wire on a drum.)
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